#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <string.h>
#include "input.h"

#define INPUT "input/03.txt"
#define INPUT_SIZE 12

void part1(char** input, size_t lineCount) {
	int oneCount[INPUT_SIZE];
	for(int k = 0; k < INPUT_SIZE; k++) {
		oneCount[k] = 0;
	}

	for(size_t i = 0; i < lineCount; i++) {
		char* line = input[i];
		for(int j = 0; j < INPUT_SIZE; j++) {
			if(line[j] == '1')
				oneCount[j]++;
		}
	}

	// null terminated string	
	char binary[INPUT_SIZE + 1];
	for(int h = 0; h < INPUT_SIZE; h++) {
		binary[h] = oneCount[h] > lineCount / 2.0f ? '1' : '0';
	}
	binary[INPUT_SIZE] = '\0';
	char* endp = NULL;
	unsigned long gamma = strtoul(binary, &endp, 2);
	unsigned long epsilon = gamma ^ 0xFFF;
	if(*endp != '\0')
		err(1, "erreur de parsing du gammaat");

	printf("%ld\n", gamma * epsilon);
}

int main() {
	// lecture du fichier d'entree
	FILE* file=fopen(INPUT,"r");
	if(file == NULL)
		err(1, "Le fichier %s n'existe pas\n", INPUT);
	
	size_t lineCount = count_lines(file);
	char** input = malloc(lineCount * sizeof(char*));
	read_lines_as_string(file, input, lineCount);
	// fermeture du fichier
	fclose(file);

	part1(input, lineCount);

	free_strings(input, lineCount);
	return 0;
}